Enable doc on gradle build

Signed-off-by: Victor <victor.cruz.isc@gmail.com>

Author: nvcruzhe

build.gradle

@@ -25,3 +25,33 @@ dependencies {
     compile group: 'io.netty', name: 'netty-all', version:'4.1.8.Final'
     testCompile group: 'junit', name: 'junit', version:'4.12'
 }
+
+task sourcesJar(type: Jar, dependsOn: classes) {
+    classifier = 'sources'
+    from sourceSets.main.allSource
+}
+
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
+artifacts {
+    archives sourcesJar
+    archives javadocJar
+}
+
+// To specify a license in the pom:
+install {
+  repositories.mavenInstaller {
+    pom.project {
+      licenses {
+        license {
+          name 'The MIT License (MIT)'
+          url 'https://github.com/bitsoex/bitso-java/blob/master/LICENSE'
+          distribution 'repo'
+        }
+      }
+    }
+  }
+}